/*
 * Copyright © 2016-2017 European Support Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.openecomp.sdc.vendorlicense.dao.types;

import com.datastax.driver.mapping.annotations.Transient;
import com.datastax.driver.mapping.annotations.UDT;
import org.apache.commons.collections4.CollectionUtils;
import org.openecomp.sdc.common.errors.CoreException;
import org.openecomp.sdc.common.errors.ErrorCode;

import java.util.HashSet;
import java.util.Set;

@UDT(keyspace = "dox", name = "multi_choice_or_other")
public class MultiChoiceOrOther<E extends Enum<E>> {

  private static final String MULTI_CHOICE_OR_OTHER_INVALID_ENUM_ERR_ID =
      "MULTI_CHOICE_OR_OTHER_INVALID_ENUM_ERR_ID";

  private static final String MULTI_CHOICE_OR_OTHER_INVALID_ENUM_MSG =
      "Enum used as part of MultiChoiceOrOther type must contain the value 'Other'";

  public static final String OTHER_ENUM_VALUE = "Other";

  @Transient
  private Set<E> choices;
  @Transient
  private String other;


  private Set<String> results;

  public MultiChoiceOrOther() {
    // Default constructor
  }

  /**
   * Instantiates a new Multi choice or other.
   *
   * @param choices the choices
   * @param other   the other
   */
  public MultiChoiceOrOther(Set<E> choices, String other) {
    this.choices = choices;
    this.other = other;
    results = resolveResult();
  }

  public Set<E> getChoices() {
    return choices;
  }

  public void setChoices(Set<E> choices) {
    this.choices = choices;
  }

  public String getOther() {
    return other;
  }

  public void setOther(String other) {
    this.other = other;
  }

  public Set<String> getResults() {
    return results;
  }

  /**
   * Sets results.
   *
   * @param results the results
   */
  public void setResults(Set<String> results) {
    if (choices != null) {
      if (results == null) {
        this.results = resolveResult();
      }
    } else {
      this.results = results;
    }
  }

  private Set<String> resolveResult() {
    if (choices != null) {
        results = new HashSet<>();
        if (choices.size() == 1 && OTHER_ENUM_VALUE.equals(choices.iterator().next().name())) {
            results.add(other);
        } else {
            for (E choice : choices) {
                results.add(choice.name());
            }
        }
    }

    return results;
  }

  /**
   * Resolve enum.
   *
   * @param enumClass the enum class
   */
  public void resolveEnum(Class<E> enumClass) {
    if (choices != null || CollectionUtils.isEmpty(results)) {
      return;
    }

    choices = new HashSet<>();
    if (results.size() > 1) {
      for (String result : results) {
        choices.add(E.valueOf(enumClass, result));
      }
    } else {
      String result = results.iterator().next();
      try {
        choices.add(E.valueOf(enumClass, result));
      } catch (IllegalArgumentException exception) {
        try {
          choices.add(E.valueOf(enumClass, OTHER_ENUM_VALUE));
        } catch (IllegalArgumentException ex) {
          throw new CoreException(new ErrorCode.ErrorCodeBuilder()
                  .withId(MULTI_CHOICE_OR_OTHER_INVALID_ENUM_ERR_ID)
                  .withMessage(MULTI_CHOICE_OR_OTHER_INVALID_ENUM_MSG).build());
        }
        other = result;
      }
    }
  }

  @Override
  public int hashCode() {
    int result = choices != null ? choices.hashCode() : 0;
    result = 31 * result + (other != null ? other.hashCode() : 0);
    result = 31 * result + (results != null ? results.hashCode() : 0);
    return result;
  }

  @Override
  public boolean equals(Object obj) {
    if (this == obj) {
      return true;
    }
    if (obj == null && choices == null && other == null && results == null ) {
      return true;
    }

    if (obj == null || getClass() != obj.getClass()) {
      return false;
    }

    MultiChoiceOrOther<?> that = (MultiChoiceOrOther<?>) obj;

    if (choices != null ? !choices.equals(that.choices) : that.choices != null) {
      return false;
    }
    if (other != null ? !other.equals(that.other) : that.other != null) {
      return false;
    }
    return results != null ? results.equals(that.results) : that.results == null;

  }
}
